Expand your horizons with a MASTER OF G — designed for pros working in the toughest of environments. Take the first step in a journey of endless exploration with the MASTER IN HORIZON GOLD, inspired by the golden horizon where earth meets sky. This is one tough watch built to deliver with refined style and rugged performance.
The design features a metal bezel finished in light yellow gold ion plating and key metal components accented with brown ion plating. Paired with a dark brown resin band, these timepieces project the awe-inspiring power of nature.
The GR-B300H-5A employs a shock-resistant Carbon Core Guard structure with carbon fiber-reinforced resin case and seamless bezel design inspired by next-generation aircraft, coming together in a bold and powerful form. Dual-time instantly switches between the time back home and local time, a practical function to make traveling abroad that much smoother. The large, raised indexes and metal bezel accentuating the large watch face enhance the visibility and functionality so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position is driven by a dual-coil motor to ensure smooth rotation and functional beauty, rotates to display alarm on/off status, serves as stopwatch, and also functions as a battery level indicator.
Case dimensions (length x width x height) shown here are standard values and may differ from actual product dimensions. Use the case dimensions provided here as general reference values.
* Dimensions show the measurements indicated in the illustration above.
59 × 54.7 × 15.7 mm
Construction
Shock Resistant
Carbon Core Guard structure
Power supply and battery life
Tough Solar (Solar powered)
Time adjustment
Bluetooth: Connects to a smartphone and automatically adjusts the time
Water resistance
200-metre water resistance
Weight
71 g
Compatible band size
145 to 215 mm
Crown
Screw Lock Crown
Glass
Mineral Glass
Other
Neobrite
Surface treatment
Light yellow gold ion plated bezel
App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Flight log
Phone finder
Apps
CASIO WATCHES
Smartphone link feature
Mobile link (Wireless linking using Bluetooth®)
Accuracy
Accuracy: ±15 seconds per month (with no mobile link function)
Alarm/hourly time signal
Daily alarm
Battery display alert
Battery level indicator
Calendar
Full auto-calendar (to year 2099)
Energy saving feature
Power Saving (hands stop to save power when the watch is left in the dark)
Light
LED light (Super Illuminator)
Afterglow
Other features
Date display
Day indicator
Regular timekeeping:
Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)
Run time
Approx. battery operating time:
5 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Stopwatch
1-second stopwatch
Measuring capacity: 23:59'59.
Measuring modes: Elapsed time, split time
Timer
Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)